Visit NAP.edu/10766 to get more information about this book, to buy it in print, or to download it as a free PDF. The greatest distance in its orbit of the Moon from the Earth; may also be applied to ...

There is no natural phenomenon that grips the imagination and stirs the soul of mankind as does a total eclipse. We ought not look at it with the eye of a dog and bark because we do not understand it.

The celestial phenomena known as “Steve” and “Picket Fence,” named for their unique appearances, were once thought to be auroras. However, recent studies suggest they are distinct phenomena. “Steve,” ...

Seeing the Northern Lights with your own eyes is likely on many people’s bucket lists. Magical, fascinating, and unique every time, the natural spectacle of the Northern Lights occurs mainly in the ...

Coloradans who look up at the night sky this Earth Day could catch a glimpse of two celestial phenomena. Colorado astronomy ...